Design a circuit for A + abs(B) = C, where A and B are 4 bits wide and 2?

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Design a circuit for A + abs(B) = C, where A and B are 4 
bits wide and 2?s complement representation

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Re: Design a circuit for A + abs(B) = C, where A and B are 4 bits wide and 2?s complement representation

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# 1

make a 4-bit adder/subtractor ( which can perform A+B and A-
B depending on value of bit say SUB..ie if SUB is 1 it will 
perform A+B ) now give A and B as inputs and make MSB of B 
as SUB bit.
suppose A=0110(6),B=1110(-2);so result will be A-B ie.,   
A+|B|=6-(-2)=8

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